Slitting machine



July 24, 1928.

R. Mcc. JOHNSTONE 'SLITTING m.

CHINE 5 Sheets-Sheet 1 Filed April 23, 1926 A TTORNE V July 24, 1928.

R. M C. JOHNSTONE SLITTING MACHINE 3 Sheets-Shet 2 Filed April 23, 1926 A Tram Er July 24, 1928. 1,678,340

R. M C. JQHNSTQNE SLITTING MACHINE 3 Sheets-Shed Filed April 25, 1926 MUN M iv; TOR

A YTTORNE Y Patented July 24, 1928.

UNITED STATES PATENT OFFICE.

ROBERT MUG. JOI-INSTONE, OF ROSELLE PARK, NEW JERSEY, ASSIGNOR TO CAMERON MACHINE COMPANY, OF BROOKLYN, NEW YORK, A CORPORATION OF NEW YORK.

SLITTING 'MACHINE.

Application filed April 23, 1926. Serial No. 104,043.

This inventionrclates to slitting machines and has for its main object and feature the production of means whereby the separatlon and bringing together of the cutting members will automatically shift the parts sidewise so that the said cutting members will not always engage each other at the same point thereby minimizing wear at any given point and consequently prolonging the life of the cutting members. This device is particularly useful where the cutting members consist of a backing roll and score-cut cutting members and although the invention is particularly adapted for use in connection with a machine of this character it will be understood that the improvement is susceptible of use in other relations.

In the accompanying drawings the invention is disclosed in a concrete and preferred form in which:

Fig. 1 is a diagrammatic front elevation of a portion of a slitting machine embodying the invention.

Fig. 2 is a detail view of arm 13 and adjacent parts showingthe extent of the traverse.

Fig. 3 is a transverse sectional view on the plane of line 3-3 of Fig. 1.

Fig. 4 is a transverse sectional v1ew on the plane of line H of Fig. 1.

Fig. 5 is a view'looking in the direction of arrow 5 of Fig. 1, partly in section.

Fig. 6 is a sectional view on the plane of line 6-6 of Fig. 5.

5 and 6 indicate two'winding drums of a slitting and winding machine. The slitting elementsare here represented as a backing roll 7 having a glass hardened surface 8, with which engages a plurality of scorecut slitters 9, each pivotally supported at 10 on cutter lever 11. A number or group of these cutter levers may be carried by support 12 and are adjustable thereon in a known manner. The construction of this part of the deviceis well known and is not claimed herein but forms the subject matter of reissue Letters Patent- No. 16,7 O2'dated August 9, 1927. .Sufiice it to say here that support 12, mounted on journals 50, is rocked toward or away from the backing roll or complementary cutting member to bring cutters 9 into and outof engagement with it.

Suitable means are provided for causing an endwise movement of support 12 when it is rocked to and fro and these means, 1n the present instance, take the following form: carried by support 12 is an arm 13 provided with a cam surface 17, which surface may be adjustable, and said arm is held both against rotation and endwise movement on support 12 by means of key 300 and clampmg bolts 31. Rotatably mounted on support 12, but prevented from endwise movement by the bushing of arm 13 and collar 26, is a ratchet 22. and a cam 25. 19 indicates a lever mounted independently of support 12 and being in this case pivotally carried on the framework at 20. This lever has a spring pressed pawl 21 engaging ratchet 22 and carries also a roll 18 actuated bycam 17 when support 12 and arm 13 are rocked.

Cam 25 extends through a complete circle and returns upon itself and with this cam engages a member mounted independently of support 12, such member being here represented by stud 27 on the framework. 23 indicates a spring anchored on stud 24 of the framework and normally tending to urge pawl 21 to engage with the tooth of the ratchet that is directly behind the last tooth with which it has engaged.

It will now be understood that, when support 12, and with it arm 13, is moved backward so as to disengage cutters 9 from the backing roll, cam 17 will act against roll 18 and will depress lever 19 against the tension of spring 23 thereby causing pawl 21 to move ratchet 22 the distance ofone tooth. This will rotate not only the ratchet but also cam 25, and the latter, by its engagement with stud 27 will slide support 12 endwise V in the framing a minute distance, say onehundredth of an inch. In this manner, when the cutting elements are again brought together they will contact with each other at a different point. When support 12 and arm 13 are moved forward, or toward the backing member, pawl 21 will slide over the ratchet teeth and will cause no movement of the ratchet. It will thus be seen that the to-and-fro movement of support 12 automatically causes an endwise movement of support 12 and that repeated rocking movements cause a step-by-step endwise movement, first in one direction and then in the other. The advantage of obtaining this endwise shifting movement automatically is that it requires no thought on the part of the operator because the operator is, in the normal use of the machine, required to move the cutters into and out of action ever so often. The expression step-by-step has been used herein. By this it is not meant that every time the cutters are disengaged the endwise shifting occurs, because cam 25 can be so constructed that it may have non-helical portions in which case the shifting would not occur so often.

Any suitable means may be used to effect the to-and-fro movement of support 12 and arm 13, but, as here shown, such means are here constructed as follows:

Arm 13 terminates in a bifurcated portion 30 and in this there is slidingly and rotative-,

ly mounted a nut 14-. 32 indicates a threaded stem or pressure screw, having handle 33,'

in threaded engagement with nut 14. Said stem passes through guide 34, which admits of tilting movement of the threaded stem but which prevents lateral displacement, and

has a pivotal support at 35. It will now be. seen that rotation of stem 32 effects move-,

ment of arm 13 and support 12 to bring the cutters into and out of engagement with the backing member. In order to compensate for the slight tilting of stem 32, nut 14 will turn in portion 30 and the sliding engagement of 14 and 230 permits arm 13 to move sidewise Without disturbing the lateral position of nut 14 or stem 32. i

9 and 9 in Fig. 2 indicate approximately the limits of the traverse of the cutting members.

I claim: 1. A cutting mechanism including: a backing member, a score-cut cutting member to Y engage therewith, means for moving said cutting member toward and away from the member, and means,actuated by the to-andfro movement of saidcutting member, to cause endwise traverse of it with respect to the backing member, to thereby establish a between the members when they reengage.

2. A cutting mechanism including: two opposed cutting members, means for movin one of said cutting members'toward and away from the other, and means, actuated by repeated to-and-fro movements of said cutting member, to cause a step-by-step endw-ise traverse, first in one direction and then in the other, of one of said cutting members with respect to the other.

3.A cutting mechanism including: two opposed cutting members, means for moving one of said cutting members toward and away from the other, and means, actuated by repeated to-and-fro movements of said cutting member, to cause a step-by-stepiendwise traverse, first in one direction and then in the other, of said cutting member with respect to the other.

4. A cutting mechanism including: a backing roll, a score-cut cutting member to engage therewith, means for moving said cutting member toward and away from the roll, and means, actuated by repeated to-and-fro movements of said cutting member, to cause a step-by-step endwise traverse, first in one direction and then in the other, of said outtllhg member with respect to the backing ro 5. A cutting mechanism including: a group of cutting members, a support for said group, complementary means with which said group of cutters cooperate, means to ad mit of movement of said support to thereby cause the group of cutting members to move toward and away from the complementary means, and means, actuated by repeated toand-fro movements of said support, to cause a step-hy-step endwise traverse, first in one directionand then in the other,'of said support with respect to the complementary means. q

6. A cutting mechanism including: a backing member, a score-cut cutting member to engage therewith, means for moving said cutting member toward and away from the member, and means, actuated by the movement of said cutting member away from the member, to cause endwise traverse of it with respect to the backing member, to thereby establish a new point of contact between the members when they reengage.

Signed at Brooklyn in the county of Kings and State ofNew York, 1926.

noBERT MoC. JOHNSTONE.

this 16 day of April, I 

